1) A way to symbolize someone acting/typing like a n00b.
2) A mispelling. (Accidental.)
3) A mispelling. (Purposeful and for effect.)
4) A last name.
5) An aliteration to an Adult Swim t-shirt.

I met this guy one day who went and told me "WHERE IS TEH BUS STOP??~???!!!111" (1) but then I told him that he sounded really stupid and that teh (2) bus stop is over there with teh store (3, I guess). He said "THANK YOU MR. TEH (4), CUS ANIME IS TEH S UCK (5).